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Full text of "Flora Indica Vol-I"

INTRODUCTORY   ESSAY.                                  59
apartments it is preserved.    As all the duplicates were made
up into sets, ticketed, and distributed at home and abroad,
this herbarium has taken the place of a standard work of
reference, and it is impossible to over-estimate its value, or
the importance of the constant access which we have enjoyed
to its contents.    The numbers attached to each plant have
been so cited by all monographists, that a reference to these,
in the great jnajority of instances, suffices for the identifica-
tion of the species -,, and we have therefore constantly quoted
the catalogue numbers, carefully examining every specimen
before doing so, iii order to avoid as much as possible the risk
of error.    The distribution appears on the whole to have been
made with much care, though the limited time allotted to its
execution prevented that critical comparison without which
species of difficult genera cauuot be discriminated.   Hence we
occasionally find two or more species under the same num-
ber and letter, and far more frequently the same species under
two or, more numbers.    It is not easy to say how many spe-
cies are contained in the WalUcliiau collection; but the 9000
mnul>crs may, we think, be diminished by at least one-fourth,
as Dr. Wallidi, being obliged to distribute without describ-
ing, very judiciously avoided uniting apparently distinct forms.
For the present therefore we estimate this great collection at
between 6500 and 7000 species.    The named specimens of
this Herbarium having bccu, as we have said, extensively dis-
tributed, it has been customary with bo taunts to retain the
names given by Dr. Wallich.    We have been careftd to do
the same ourselves for all otherwise unpublished genera and
fcipecieaj  but where published names, accompanied with de-
scriptions, have come in contact with them, we have consi-
dered it to be our duty to follow the generally recognized rule
of priority, and to retain the published one; cxcep^ of coarse,
iu oases where the authors of these names had habitually
availed themselves of the Walliehian collections, and where
we feel justified in assuming that they would wish to have
adopted the Walliehian name had they recognized the plant.